R. T. Sutherland, Raghavendra Srinivas, Shaun C. Burd, Dietrich G. Leibfried, Andrew C. Wilson, David J. Wineland, David T. Allcock, Daniel H. Slichter, S. B. Libby
We present a general theory for laser-free entangling gates with trapped-ion hyperfine qubits, using either static or oscillating magnetic-field gradients combined with a pair of uniform microwave fields symmetrically detuned about the qubit frequency. By transforming into a `bichromatic' interaction picture, we show that either σΦσΦ or σzσz geometric phase gates can be performed. The gate basis is determined by selecting the microwave detuning. The driving parameters can be tuned to provide intrinsic dynamical decoupling from qubit frequency fluctuations. The σzσz gates can be implemented in a novel manner which eases experimental constraints. We present numerical simulations of gate fidelities assuming realistic parameters. present numerical simulations of gate fidelities assuming realistic parameters.